There is nothing _____ difficult than to make such an decision.
A. very
B. rather
C. so
D. as to
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Has she got an invitation? I don't remember ______ her.
A. inviting
B. to invite
C. invite
D. to be inviting
As a manager, she is _______ training new employees.
A. grateful for
B. charged with
C. in charge of
D. responsible to
She must be from Afric, ______ can be seen from her dark skin.
A. that
B. what
C. which
D. where
There is _________ so clever as the boy.
A. someone
B. something
C. nothing
D. nobody
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